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These case studies show the performance using
Sitelab’s UVF-3100 analyzer testing gasoline range organic hydrocarbons.
This includes benzene, xylene, BTEX and other volatile petroleum
compounds in the GRO or VPH C6 to C10 hydrocarbon range.
When calibrated using Sitelab's GRO calibration kit
(CAL-025), the UVF analyzer produces test results that correlate
well to laboratory regulatory methods using GC instrumation.
Both the UVF-3100A and UVF-3100D models are fitted with special optical filters sensitive to hydrocarbons commonly found in
gasoline, jet fuel, diesel fuel, gas condensates and many other
light-refined petroleum products.
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Performance Study at UST
Site
Evaluation study performed by customer testing soil samples at a
former gas station in Massachusetts. They wanted to know how Sitelab's
GRO test compares to two different
laboratory methods, GRO and VPH, commonly used in the
United States and
elseware. Sitelab correlated well to both methods.
Click image for
details>>
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Still using a
PID to Screen Soils?
"Jar
Headspace" using photo ionization detectors (PIDs) is common practice
for field screening soils contaminated with petroleum
hydrocarbons. PIDs detect air vapors in soil for volatile
organic compounds. Despite their popularity, however, PIDs
can often give false readings. Data shown here
compares GRO to PID concentrations testing soils contaminated by
weathered gasoline. Not surprisingly, results did not correlate
very well.
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Grab samples were collected from borings in 1 to 2 foot intervals and then screened using a PID and UVF to
delineate the vertical subsurface extent of contamination.
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Accuracy Testing GRO in Water
Sitelab's
UVF-3100 performed well testing blind, NELAC certified, spiked water samples
provided by Environmental Resource Associates (Arvada, CO). Results
were compared to the GRO in water concentrations reported by 83
participating laboratories using a variety of gas chromatography methods.
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»GRO
in Water Study Results |
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»Water Performance Studies |
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U.S. EPA GRO in Soil Performance
During the U.S.
Environmental Protection Agency's TPH in Soil Evaluation Study, a group of soils were
spiked in triplicate with weathered gasoline having variable
concentrations. Weathered gasoline contains BTEX and
other volatile petroleum hydrocarbons, which make up the GRO
fraction found in total petroleum hydrocarbons.
Results were compared to a certified laboratory who
performed SW-846 Method 8015B.
EPA evaluated Sitelab's UVF-3100A and six other
manufacturers during the program.
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Innovative
Technology Verification Report No. EPA/600/R-01/080 |
Both Sitelab and the laboratory GC method have the
ability to measure GRO and DRO separately in TPH.
Sitelab was the only participant who's field device is
capable of performing these two tests. |
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U.S.
EPA Soils from Air Force Base
Soils from Kelly Air Force Base
in San Antonio, Texas, were analyzed for GRO as part of the
EPA’s TPH in Soil Evaluation Study.
Samples were collected from an active underground
storage tank (UST) farm, that serves as the government vehicle
refueling station at the base. Soils tested consisted
of sandy clays with silty sand and gravel. EPA reported that for GRO measurement bias "seven of the
eight UVF-3100A results were within 50 percent of the
reference method result," page 66.
Samples collected from other environmental sites located in
Indiana and California were included during the study (87
samples in total). TPH was reported by adding the GRO
and DRO concentrations together.
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Sitelab technician tests
samples with EPA’s contractor, Tetra Tech, observing during the final
demonstration at the Port Hueneme Navy Base in southern California.
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»Download
EPA's Evaluation Report
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»See
more EPA evaluation studies highlighting Sitelab's performance |
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